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Subgroup analysis of steadily increased trends in medullary thyroid carcinoma incidence and mortality in the United States, 2000-2020: a population-based retrospective cohort study.

Endocrine-related Cancer 2024 Februrary 2
The incidence rate of medullary thyroid carcinoma (MTC) continues to grow, along with its mortality rate in the United States. However, the subgroup trends in medullary thyroid carcinoma have not yet been established. This population-based retrospective cohort study was based on the Surveillance, Epidemiology, and End Results-17/12 registry database. Subgroup analysis was performed through clinicopathological and treatment-related characteristics. Annual average percent change (AAPC) was calculated using joinpoint regression analysis. A total of 3833 MTC patients and 536 death cases were diagnosed in the SEER database. Between 2000-2019, the incidence (AAPC=1.64) and mortality (AAPC=3.46) rates of MTC continued to rise. Subgroup analysis showed the proportion of elderly patients (65-84 years) gradually increased in incidence between 2000-2020. Patients with early-stage tumors like tumors ≤20mm showed the same trends. Aspects of treatment, the implementation rate of total thyroidectomy (AAPC=0.38) and lymph node dissection (AAPC=1.06) also increased persistently in almost all of the age subgroups. The incidence and mortality of medullary thyroid carcinoma consistently increased from 2000 to 2019. Subgroup analysis indicated a significant increase in elder patients and early-stage patients, and more attention should be paid to the management of these increased subgroups.

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